Make it True

81 x 9 = 801. What must you do to make the this equation true?




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Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
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x = 10

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